Elizabeth tower, formerly known as Big Ben, is the bell tower of the Palace of Westminster, one of the most famous Gothic buildings in the world, and is also another name for the big newspaper clock attached to the bell tower of the British Parliament Hall. It is a bell tower on the Thames in London, England, and it is one of the landmark buildings in London. The bell tower is 95 meters high, 7 meters in diameter and weighs 13.5 tons. Ring every 15 minutes and ring the Westminster clock. Big Ben has been affected since the construction of the Jubilee subway line. Measurements show that Big Ben is tilted to the northwest by about half a meter. Elizabeth tower was built in April 1858, which is the largest clock in Britain. The tower is 320 feet high (about 97.5 meters) and the minute hand length is 14 feet (about 4.27 meters). Big Ben is wound manually. When Congress is in session, the clock face will glow and strike the hour. Every year, when switching between daylight saving time and winter time, the clock will stop, repair, replace parts and adjust the clock.